Abstract
The demand for higher bandwidth in Local Area Networks (LANs) has fuelled
considerable research in techniques for mitigating modal dispersion in multimode fiber
(MMF). These techniques include selective mode excitation, offset launching, angular
multiplexing and electronic dispersion compensation, all of which strive to optimize the
channel impulse response of a MMF. To obtain the optimal bandwidth-enhancement results
from these techniques, knowledge of the distribution of power coupling coefficients
given an arbitrary offset launch in a MMF is important. In this paper, an analytical
expression for the power coupling coefficient for an incident Gaussian beam launched
with a radial offset into a MMF having an infinite parabolic refractive index profile is
derived. This expression is useful in understanding the parameters which may affect the
power coupling coefficient and how they may enhance the MMF bandwidth. The power
coupling coefficients obtained from the derived analytical expression are compared with
numerical results and are in excellent agreement. The analytical expression may be
extended to manufactured MMF.
© 2010 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription